Update boss_files.erl

add sub folder for model, use case: porting php/mysql app to chicagoboss, you deal with hundred of model sometime ;(, add sub folder help a bit :) to manage it, model_list/2 mimic the module_list only for model
Initial common test structure
Merge branch 'master' into mihawk-patch-2
start refactoring files, adding tests
Merge pull request #365 from zkessin/mihawk-patch-2

Mihawk patch 2